<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>
  <script>
  //练习一：和某人打招呼
  function sayHello(name) {
console.log(`Hello ${name}!`)
  }
  
  
  sayHello("cyh")
  //练习二：给某人唱生日歌
  function singBirthdaySong(name){
    console.log("happy birthday to you")
    console.log("happy birthday to you")
    console.log(`happy birthday to ${name}`)
    console.log("happy birthday to you")
  }
  singBirthdaySong('cyh')
  </script>
</body>
</html>